:root{--bg:#08111f;--card:#101c2e;--card2:#14243a;--text:#eef5ff;--muted:#9fb0c8;--accent:#ff9900;--ok:#39d98a;--bad:#ff647c;--line:#263a55}
*{box-sizing:border-box}body{margin:0;font-family:-apple-system,BlinkMacSystemFont,"Segoe UI",sans-serif;background:linear-gradient(145deg,#07101d,#0d1930 55%,#111d31);color:var(--text);min-height:100vh}.wrap{max-width:760px;margin:auto;padding:20px}.topbar{display:flex;align-items:flex-start;justify-content:space-between;gap:12px}.brand{font-size:22px;font-weight:900;cursor:pointer;display:inline-flex;gap:10px;align-items:center}.version{font-size:12px;font-weight:900;letter-spacing:.3px;color:#ffd28a;background:#2a1d08;border:1px solid #6c4b12;border-radius:999px;padding:7px 10px;white-space:nowrap}.aws{color:var(--accent)}.sub{color:var(--muted);font-size:13px;margin-top:5px}.card{background:rgba(16,28,46,.94);border:1px solid var(--line);border-radius:20px;padding:20px;margin-top:20px;box-shadow:0 14px 45px #0005}.hero h1{font-size:29px;margin:4px 0 8px}.hero p{color:var(--muted);line-height:1.7}.grid{display:grid;grid-template-columns:1fr 1fr;gap:12px}.btn{border:0;border-radius:14px;padding:15px 12px;font-weight:800;font-size:15px;cursor:pointer;background:var(--card2);color:var(--text);border:1px solid var(--line)}.btn.primary{background:var(--accent);color:#1c1306;border-color:var(--accent)}.btn:hover{filter:brightness(1.08)}.stats{display:grid;grid-template-columns:repeat(3,1fr);gap:10px;margin-top:16px}.stat{background:#0b1728;border-radius:14px;padding:13px;text-align:center;border:1px solid var(--line)}.stat b{font-size:21px;display:block}.stat span{font-size:11px;color:var(--muted)}.bar{height:10px;background:#07111f;border-radius:99px;overflow:hidden;margin-top:8px}.fill{height:100%;background:var(--accent)}.qmeta{display:flex;justify-content:space-between;color:var(--muted);font-size:13px}.question{font-size:20px;font-weight:800;line-height:1.55;margin:18px 0}.answers{display:grid;gap:10px}.answer{text-align:left;padding:14px;border-radius:13px;border:1px solid var(--line);background:#0d1a2c;color:var(--text);cursor:pointer;font-size:15px;line-height:1.45}.answer.selected{outline:3px solid var(--accent);background:#24344d;color:#fff}.answer.correct{border-color:var(--ok);background:#123527}.answer.wrong{border-color:var(--bad);background:#3b1922}.explain{margin-top:16px;padding:15px;background:#0a1626;border-radius:14px;border-left:4px solid var(--accent);line-height:1.75}.explain h3{margin:16px 0 6px;font-size:14px;color:var(--accent)}.explain .lead{font-size:15px;line-height:1.8}.choicewhy{display:grid;gap:8px;margin-top:8px}.choicewhy div{padding:10px 12px;border:1px solid var(--line);border-radius:10px;background:#0d1a2c;font-size:13px;line-height:1.6}.choicewhy b{color:#dfeaff}.memory{margin-top:10px;padding:11px 12px;background:#261d09;border:1px solid #604614;border-radius:10px;color:#ffe1a3;font-size:13px;line-height:1.6}.compare{margin-top:8px;padding:10px 12px;background:#0d1a2c;border:1px solid var(--line);border-radius:10px;font-size:13px;line-height:1.65}.explain ul{margin:6px 0 4px;padding-left:20px}.explain li{margin:5px 0}.examtip{margin-top:10px;padding:10px 12px;background:#101f34;border-radius:10px;color:#d8e6f7;font-size:13px}.study-section h2{margin:4px 0 8px}.study-section h3{color:var(--accent);margin:22px 0 8px}.study-section p,.study-section li{line-height:1.75}.study-section ul{padding-left:20px}.study-box{background:#0b1728;border:1px solid var(--line);border-radius:14px;padding:14px;margin:10px 0}.study-box b{color:#fff}.study-table{width:100%;border-collapse:collapse;font-size:13px;margin-top:10px}.study-table th,.study-table td{border-bottom:1px solid var(--line);padding:10px 7px;text-align:left;vertical-align:top}.study-table th{color:var(--accent)}.study-note{background:#261d09;border:1px solid #604614;border-radius:12px;padding:12px;color:#ffe1a3;line-height:1.65;transition:.2s}.sheet-controls{margin:14px 0}.sheet-hint{font-size:12px;color:var(--muted);line-height:1.6}.memory-blank{display:inline-block;padding:0 .18em;border-radius:5px;transition:.15s;cursor:pointer}.sheet-red .service-blank,.sheet-both .service-blank{color:transparent!important;background:#ead7d7;border-bottom:2px solid #d06363;text-shadow:none;user-select:none;min-width:2.2em}.sheet-green .concept-blank,.sheet-both .concept-blank{color:transparent!important;background:#d9e8dc;border-bottom:2px solid #62a76f;text-shadow:none;user-select:none;min-width:2.2em}.sheet-red .service-blank.revealed,.sheet-both .service-blank.revealed{color:#ffe7b5!important;background:#5b251d;border-bottom-color:#ff9900}.sheet-green .concept-blank.revealed,.sheet-both .concept-blank.revealed{color:#eaffed!important;background:#204c2a;border-bottom-color:#72d987}.floating-sheet{position:fixed;right:max(10px,calc((100vw - 760px)/2 + 10px));bottom:calc(14px + env(safe-area-inset-bottom));z-index:999;display:none;flex-direction:column;gap:7px;background:#0c1728eF;color:#eef5ff;border:1px solid #38506f;border-radius:16px;padding:9px;box-shadow:0 10px 30px #0009;backdrop-filter:blur(10px)}.floating-sheet.show{display:flex}.sheet-mode-title{font-size:10px;color:#aebbd0;font-weight:800;text-align:center}.sheet-mode-row{display:flex;gap:6px}.sheet-mode-btn{border:1px solid #3a4d67;background:#14243a;color:#eaf2ff;border-radius:10px;padding:8px 9px;font-size:12px;font-weight:900;cursor:pointer;white-space:nowrap}.sheet-mode-btn.red.active{background:#8b2020;border-color:#ff6f6f}.sheet-mode-btn.green.active{background:#236533;border-color:#6bd47d}.sheet-mode-btn.both.active{background:linear-gradient(90deg,#7d2424,#286437);border-color:#d6cf83}.sheet-mode-btn.off.active{background:#38485e;border-color:#8093ac}@media(max-width:520px){.floating-sheet{right:8px;bottom:calc(10px + env(safe-area-inset-bottom));padding:7px}.sheet-mode-btn{padding:7px 8px;font-size:11px}}.tag{display:inline-block;font-size:11px;padding:5px 8px;border-radius:99px;background:#20314a;color:#c6d5e9}.next{width:100%;margin-top:15px;position:sticky;bottom:calc(10px + env(safe-area-inset-bottom));z-index:8;box-shadow:0 8px 24px #0008}.list-tools{display:grid;grid-template-columns:1.5fr 1fr;gap:10px;margin:14px 0}.list-tools input,.list-tools select{width:100%;min-height:46px;border-radius:12px;border:1px solid var(--line);background:#0b1728;color:var(--text);padding:10px 12px;font-size:16px}.list-summary{color:var(--muted);font-size:13px;margin:8px 0 12px}.question-list{display:grid;gap:10px}.question-item{border:1px solid var(--line);border-radius:14px;background:#0b1728;overflow:hidden}.question-head{width:100%;display:block;text-align:left;background:transparent;border:0;color:var(--text);padding:14px;cursor:pointer}.question-head-top{display:flex;align-items:center;justify-content:space-between;gap:10px;margin-bottom:7px}.question-no{font-weight:900;color:var(--accent);font-size:13px}.question-domain{font-size:10px;color:#c6d5e9;background:#20314a;border-radius:999px;padding:4px 7px}.question-preview{font-size:14px;line-height:1.65;font-weight:700}.question-detail{display:none;border-top:1px solid var(--line);padding:13px 14px;background:#0d1a2c}.question-item.open .question-detail{display:block}.question-options{display:grid;gap:7px;margin:7px 0 10px}.question-option{font-size:13px;line-height:1.5;padding:8px 10px;border-radius:9px;background:#101f34;border:1px solid #263a55}.question-option.is-correct{border-color:#3f7f63;background:#123527}.answer-label{font-size:12px;color:var(--muted);margin-top:8px}.list-empty{text-align:center;color:var(--muted);padding:28px 12px}.hidden{display:none}@media(max-width:520px){.list-tools{grid-template-columns:1fr}.question-head-top{align-items:flex-start}.question-domain{white-space:normal;text-align:right}}
.question-table-wrap{overflow-x:auto;border:1px solid var(--line);border-radius:14px;background:#0b1728}.question-table{width:100%;border-collapse:collapse;min-width:680px;font-size:13px}.question-table th,.question-table td{padding:11px 10px;border-bottom:1px solid var(--line);text-align:left;vertical-align:top}.question-table th{position:sticky;top:0;background:#101f34;color:var(--accent);z-index:1}.question-table tr:last-child td{border-bottom:0}.question-table .col-no{width:58px;white-space:nowrap;font-weight:900;color:var(--accent)}.question-table .col-domain{width:150px;color:#c6d5e9}.question-table .col-status{width:92px;white-space:nowrap;font-weight:900;text-align:center}.status-correct{color:var(--ok)}.status-wrong{color:var(--bad)}.status-unanswered{color:var(--muted)}.question-table .col-question{line-height:1.6;font-weight:700}.legend{display:flex;gap:14px;flex-wrap:wrap;font-size:12px;color:var(--muted);margin:8px 0 12px}.legend b{font-weight:900}.question-list{display:block}.question-item,.question-head,.question-detail{display:none!important}
.result{text-align:center}.result .big{font-size:48px;font-weight:900;color:var(--accent)}@media(max-width:520px){.grid{grid-template-columns:1fr}.hero h1{font-size:25px}.wrap{padding:15px}}

/* ORIVECTOR quiz layout v1 — CSS only. No quiz DOM or start/answer logic is changed. */
#quiz{max-width:760px;margin:18px auto 0;padding:20px;background:linear-gradient(180deg,rgba(16,28,46,.98),rgba(11,23,40,.98));border:1px solid #2f4664;border-radius:20px;box-shadow:0 18px 46px #0006}
#quiz .qmeta{display:flex;align-items:center;justify-content:space-between;gap:10px;margin:0 0 14px;padding:10px 12px;background:#0b1728;border:1px solid #263a55;border-radius:13px;font-size:12px;font-weight:850;color:#aebed1}
#quiz #qnum{color:#ffd28a;white-space:nowrap}
#quiz #domain{max-width:66%;overflow:hidden;text-overflow:ellipsis;white-space:nowrap;text-align:right}
#quiz .question{margin:4px 0 18px;font-size:clamp(20px,4.8vw,25px);line-height:1.65;letter-spacing:.01em}
#quiz .answers{display:grid;gap:10px}
#quiz .answer{width:100%;min-height:56px;padding:15px 16px;border-radius:14px;background:#0d1c30;border:1px solid #2b4563;color:#eef5ff;font-size:15px;font-weight:750;line-height:1.55;box-shadow:none;transition:border-color .12s,background .12s,transform .08s}
#quiz .answer:active{transform:scale(.995)}
#quiz .answer.selected{outline:2px solid #ff9900;outline-offset:1px;background:#2a2418;border-color:#ff9900}
#quiz .answer.correct{background:#103524;border-color:#39d98a}
#quiz .answer.wrong{background:#3a1822;border-color:#ff647c}
#quiz .explain{margin-top:16px;padding:17px;background:#0b1728;border:1px solid #29425f;border-left:4px solid #ff9900;border-radius:14px;line-height:1.8;box-shadow:none}
#quiz #next{min-height:52px;margin-top:16px;border-radius:14px;font-size:15px;font-weight:900}
@media(max-width:520px){#quiz{margin-top:14px;padding:15px;border-radius:17px}#quiz .qmeta{padding:9px 10px;margin-bottom:12px}#quiz .question{font-size:20px;margin-bottom:15px}#quiz .answer{min-height:54px;padding:14px 13px}#quiz .explain{padding:15px}}